September weather forecast and climate
Key Largo, FL

A clear seascape and cloudy evening sky in Key Largo, Florida
A clear seascape and cloudy evening sky in Key Largo, Florida

What is the warmest month in Key Largo?

July through September, with an average high-temperature of 89.6°F (32°C), are warmest months in Key Largo, Florida.

What is the temperature in September in Key Largo?

In September, in Key Largo, the average high-temperature is 89.6°F (32°C), and the average low-temperature is 73.4°F (23°C).

How many days does it rain in September in Key Largo?

In Key Largo, in September, during 17 rainfall days, typically, 8.4" (213mm) of precipitation is accumulated.

What is the sea water temperature in September in Key Largo?

In Key Largo, in September, the average water temperature is 85.6°F (29.8°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.
Average temperature in September - Key Largo, FL
  • Average high temperature in September: 90°F

Warmest months (with the highest average high temperature) are July, August and September (90°F).
The month with the lowest average high temperature is January (75°F).

  • Average low temperature in September: 73°F

Months with the highest average low temperature are July, August and September (73°F).
Coldest months (with the lowest average low temperature) are January and February (57°F).

Average rainfall in September - Key Largo, FL
  • Average rainfall in September: 8.4"

The wettest month (with the highest rainfall) is June (10").
The driest month (with the lowest rainfall) is December (1.4").

Average rainfall days in September - Key Largo, FL
  • Average rainfall days in September: 17 days

Months with the highest number of rainy days are August and September (17 days).
The month with the lowest number of rainy days is April (5 days).

Average sea temperature in September - Key Largo, FL
  • Average sea temperature in September: 85.6°F

The best month for swimming (with the highest average sea temperature) is August (86.8°F).
The coldest month (with the lowest average sea temperature) is February (72.6°F).

Average daylight in September / Average sunshine in September - Key Largo, FL
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.7h).
The month with shortest days is December (Average daylight: 10.6h).

  • Average sunshine in September: 9h

Months with most sunshine are April, May, June and July (Average sunshine: 10h).
Months with least sunshine are January, November and December (Average sunshine: 7).

Average UV index in September - Key Largo, FL
  • Average UV index in September: 10

Months with the highest UV index are April, May, June, July and August (UV index 11).
The month with the lowest UV index is December (UV index 5).

deutscheenglishespañolрусский中文